Im 18 and i like a 25 year old guy.?

ok so, on any other day in any other place i wouldn't of looked twice at the clearly much older guys talking to me but to be honest i wasn't sure he was flirting with me until he kissed me. from the top... i was shopping in soho wearing an utterly bright lime green shirt and some rather attractive guy stops me telling me about the same comedy club all other people do in Manhattan. t because hes cute i decide to stop and listen and before i know it im buying tickets for something i don't want. after he convinced me to buy these damn tickets which i only bought because he said he would be there we kept talking. and talking and talking. and he was charming and cute and awkward and if he was saying these things ot any other girl but me they would of walked away. but no im freak so i enjoyed his strange pick up lines and perfect blue eyes. i had places to be that night, a party to go to with my 17 year old boyfriends figure but here i was standing in soho infatuated by some stranger who i couldn't seem to walk away from. and when i finally decided to walk away after 2 hours he grabbed me and kissed me, at that point i never wanted to walk away. we hung out for another hour talking about nonsense and other nothingness and to my utter surprise i could talk to him with no nerves or tension. that's strange because even guys my own age make me nervous. anyway i gave him my number this way he can call me if he wants to because if he changes his mind on me being to young. i don't know what to do but when i did go to the party with the guy i should be with i realized i didn't like him and we had been an item for more then a few months. i don't know what to do and the age gap freaks me out. were supposed to hangout tomorrow but idk.